#include <HX711.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 
int pinpulsador_up=5;
int pinpulsador_down=15;
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library. 
// On an arduino UNO:       A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
// On an esp32:   2(SDA),  3(SCL), ...
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C //0x3D ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
//bascula.tare();
byte pinData = 18;
byte pinClk = 4;
int peso =0;
int columna = 70;
int limite;
int incremento = 0;
int pulsador = 7; 
HX711 bascula;

  void setup() {
  bascula.begin(pinData, pinClk);  
  bascula.set_scale(10);
  
  Serial.begin(115200);
  Wire.begin(21,22);      
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  pinMode (pinpulsador_up, INPUT);
  pinMode (pinpulsador_down, INPUT);
  //limite=0;
   }
void loop(){
	Serial.begin(115200);
  peso = bascula.get_units()/2;
  //print_reset_reason();
  Wire.begin(21,22);
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
   Serial.println(F("SSD1306 allocation failed"));
    for (;;)
      ;  // Don't proceed, loop forever
  }
  Serial.println(F("SSD1306 allocation OK"));
 // display.display();
  // delay(2000);

  display.clearDisplay();
  if (digitalRead(pinpulsador_up) == LOW) {
    limite +=5;}
  if (digitalRead(pinpulsador_down) == LOW) {
    limite -=5;
    if (limite <0 )
    { limite=0;}
    }

	display.setTextSize(2); // Draw 2X-scale text
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(10, 0);
  display.println(limite);
	display.setTextSize(3);

  if (peso < 10)
  {columna = 70;}

  if (peso >= 10)
  {columna = 46;}

  display.setTextColor(SSD1306_WHITE);
   display.setCursor(columna, 35);
  display.println(peso);
  display.display();     
}